PM / TECH LEAD / SE TEST

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1 PM / TECH LEAD / SE TEST Name Contact Position applied Current salary Expected salary VND, gross VND, gross Score / 65 Time required: 60 mins Please select only one answer for each question. You may provide some explanation if you are unable to find the answer.

2 <A> DATA TYPE QUESTIONS 1 What is the error in this code? byte b = 50; b = b * 50; a) b can not contain value 100, limited by its range. b) * operator has converted b * 50 into int, which can not be converted to byte without casting. c) b can not contain value 50. d) No error in this code 2 types? a) long b) int c) double d) float 3 What is Truncation is Java? a) Floating-point value assigned to an integer type. b) Integer value assigned to floating type. c) Floating-point value assigned to an Floating type. d) Integer value assigned to floating type. 4 What is the output of this program? class char_increment char c1 = 'D'; char c2 = 84; c2++; c1++; System.out.println(c1 + " " + c2); a) E U b) U E c) V E d) U F 5 What is the output of this program? class conversion double a = ; int b = 300; byte c = (byte) a; byte d = (byte) b; System.out.println(c + " " + d); a) b) c) d)

3 6 What is the output of this program? class A final public int calculate(int a, int b) return 1; class B extends A public int calculate(int a, int b) return 2; public class output B object = new B(); System.out.print("b is " + b.calculate(0, 1)); a) b is : 2 b) b is : 1 c) Compilation Error. d) An exception is thrown at runtime. 7 Which of these is data type long literal? a) 0x99fffL b) ABCDEFG c) 0x99fffa d) What is the output of this program? class dynamic_initialization double a, b; a = 3.0; b = 4.0; double c = Math.sqrt(a * a + b * b); System.out.println(c); a) 5.0 b) 25.0 c) 7.0 d) Compilation Error

4 9 What is the output of this program? class multidimention_array int arr[][] = new int[3][]; arr[0] = new int[1]; arr[1] = new int[2]; arr[2] = new int[3]; int sum = 0; for (int i = 0; i < 3; ++i) for (int j = 0; j < i + 1; ++j) arr[i][j] = j + 1; for (int i = 0; i < 3; ++i) for (int j = 0; j < i + 1; ++j) sum + = arr[i][j]; System.out.print(sum); a) 11 b) 10 c) 13 d) What is the output of this program? class array_output char array_variable [] = new char[10]; for (int i = 0; i < 10; ++i) array_variable[i] = 'i'; System.out.print(array_variable[i] + ""); a) b) c) i j k l m n o p q r d) i i i i i i i i i i

5 INHERITANCE QUESTIONS 1 Which of these keyword must be used to inherit a class? a) super b) this c) extent d) extends 2 What is the output of this program? class A int i; class B extends A int j; void display() super.i = j + 1; System.out.println(j + " " + i); class inheritance B obj = new B(); obj.i=1; obj.j=2; obj.display(); a) 2 2 b) 3 3 c) 2 3 d) A class member declared protected becomes member of subclass of which type? a) public member b) private member c) protected member d) static member

6 4 What is the output of this program? class A int i; void display() System.out.println(i); class B extends A int j; void display() System.out.println(j); class inheritance_demo B obj = new B(); obj.i=1; obj.j=2; obj.display(); a) 0 b) 1 c) 2 d) Compilation Error 5 What is the output of this program? class A public int i; protected int j; class B extends A int j; void display() super.j = 3; System.out.println(i + " " + j); class Output B obj = new B(); obj.i=1; obj.j=2; obj.display(); a) 1 2 b) 2 1 c) 1 3 d) 3 1

7 <C> TRY CATCH QUESTIONS 1 Which of these keywords are used for the block to be examined for exceptions? a) try b) catch c) throw d) check 2 Which of these keywords are used for generating an exception manually? a) try b) catch c) throw d) check 3 Which of these statements is incorrect? a) try block need not to be followed by catch block. b) try block can be followed by finally block instead of catch block. c) try can be followed by both catch and finally block. d) try need not to be followed by anything. 4 What is the output of this program? class Output try int a = 0; int b = 5; int c = b / a; System.out.print("Hello"); catch(exception e) System.out.print("World"); a) Hello b) World c) HelloWOrld d) Compilation Error 5 What is the output of this program? class Output try int a = 0; int b = 5; int c = b / a; System.out.print("Hello"); a) Hello b) World c) HelloWOrld d) Compilation Error

8 <D> RESTRICTION QUESTIONS 1 Which of these types cannot be used to initiate a generic type? a) Integer class b) Float class c) Primitive Types d) Collections 2 Which of these instance cannot be created? a) Integer instance. b) Generic class instance. c) Generic type instance. d) Collection instances. 3 Which of these data type cannot be type parameterized? a) Array b) List c) Map d) Set 4 What is the output of this program? public class BoxDemo public static void addbox(u u, java.util.list<box> boxes) Box box = new Box<>(); box.set(u); boxes.add(box); public static void outputboxes(java.util.list<box> boxes) int counter = 0; for (Box box: boxes) U boxcontents = box.get(); System.out.println("Box #" + counter + " contains [" + boxcontents.tostring() + "]"); counter++; public static void main(string[] args) java.util.arraylist<box<integer>> listofintegerboxes = new java.util.arraylist<>(); BoxDemo.<Integer>addBox(Integer.valueOf(10), listofintegerboxes); BoxDemo.outputBoxes(listOfIntegerBoxes); a) 10 b) Box #0 [10] c) Box contains [10] d) Box #0 contains [10]

9 5 What is the output of this program? import java.util.*; public class genericstack <E> Stack <E> stk = new Stack <E>(); public void push(e obj) stk.push(obj); public E pop() E obj = stk.pop(); return obj; class Output genericstack <Integer> gs = new genericstack<integer>(); gs.push(36); System.out.println(gs.pop()); a) H b) Hello c) Runtime Error d) Compilation Error

10 <E> MIXED QUESTIONS 1 What is the output of this program? class newthread implements Runnable Thread t; newthread() t1 = new Thread(this,"Thread_1"); t2 = new Thread(this,"Thread_2"); t1.start(); t2.start(); public void run() t2.setpriority(thread.max_priority); System.out.print(t1.equals(t2)); class multithreaded_programing new newthread(); a) true b) false c) truetrue d) falsefalse 2 What is the output of this program? class newthread implements Runnable Thread t; newthread() t = new Thread(this,"New Thread"); t.start(); public void run() t.setpriority(thread.max_priority); System.out.println(t); class multithreaded_programing new newthread(); a) Thread[New Thread,0,main] b) Thread[New Thread,1,main] c) Thread[New Thread,5,main] d) Thread[New Thread,10,main]

11 3 What is the output of this program? class recursion int fact(int n) int result; if (n == 1) return 1; result = fact(n - 1) * n; return result; class Output recursion obj = new recursion() ; System.out.print(obj.fact(6)); a) 1 b) 30 c) 120 d) What is the output of this program? class recursion int fact(int n) int result; if (n == 1) return 1; result = fact(n - 1) * n; return result; class Output recursion obj = new recursion() ; System.out.print(obj.fact(5)); a) 24 b) 30 c) 120 d) 720

12 5 What is the output of this program? import java.text.*; import java.util.*; class Date_formatting Date date = new Date(); SimpleDateFormat sdf; sdf = new SimpleDateFormat("z"); System.out.print(sdf.format(date)); Note : The program is executed at 3 hour 55 minutes and 4 sec on Monday, 15 July(24 hours time). a) z b) Jul c) Mon d) PDT 6 What is the output of this program? import java.text.*; import java.util.*; class Date_formatting Date date = new Date(); SimpleDateFormat sdf; sdf = new SimpleDateFormat("mm:hh:ss"); System.out.print(sdf.format(date)); Note : The program is executed at 3 hour 55 minutes and 4 sec (24 hours time). a) 3:55:4 b) c) 55:03:04 d) 03:55:04

13 7 What is the output of this program? class newthread extends Thread newthread() super("my Thread"); start(); public void run() System.out.println(this); class multithreaded_programing new newthread(); a) My Thread b) Thread[My Thread,5,main] c) Compilation Error d) Runtime Error 8 What is the output of this program? class leftshift_operator byte x = 64; int i; byte y; i = x << 2; y = (byte) (x << 2) System.out.print(i + " " + y); a) 0 64 b) 64 0 c) d) 256 0

14 9 What is the output of this program? class Output int a = 1; int b = 2; int c = 3; a = 4; b >>= 1; c <<= 1; a ^= c; System.out.println(a + " " + b + " " + c); a) b) c) d) What is the output of this program? import java.net.*; class networking public static void main(string[] args) throws Exception URL obj = new URL(" URLConnection obj1 = obj.openconnection(); int len = obj1.getcontentlength(); System.out.print(len); Note: Host URL is having length of content 127. a) 126 b) 127 c) Compilation Error d) Runtime Error

15 <F> J2EE QUESTIONS 1 Which JDBC driver Type(s) can be used in either applet or servlet code? A. Both Type 1 and Type 2 B. Both Type 1 and Type 3 C. Both Type 3 and Type 4 D. Type 4 only 2 What is not true of a Java bean? A. There are no public instance variables. B. All persistent values are accessed using getxxx and setxxx methods. C. It may have many constructors as necessary. D. All of the above are true of a Java bean. 3 Which JDBC driver Type(s) can you use in a three-tier architecture and if the Web server and the DBMS are running on the same machine? A. Type 1 only B. Type 2 only C. Both Type 3 and Type 4 D. All of Type 1, Type 2, Type 3 and Type 4 4 class Test private Demo d; void start() d = new Demo(); this.takedemo(d); /* Line 7 */ /* Line 8 */ void takedemo(demo demo) demo = null; demo = new Demo(); When is the Demo object eligible for garbage collection? A. After line 7 B. After line 8 C. After the start() method completes D. When the instance running this code is made eligible for garbage collection. 5 In JSP Action tags which tags are used for bean development? A) jsp:usebean B) jsp:setpoperty C) jsp:getproperty D) All mentioned above 6 EJB (Enterprise Java Bean) is used to develop which type of applications in java? A) Scalable B) Robust C) Secured D) All mentioned above

16 7 In the development of EJB which version is faster because of simplicity and annotations etc.? A) EJB 3 B) EJB 2 C) EJB 1 D) None of the above 8 The life cycle of session bean is not maintained by the application server (EJB Container)? A) True B) False 9 In which session Bean conversational state between multiple method calls is not maintained by the container in case of? A) Stateful Session Bean B) Stateless Session Bean C) Singleton Session Bean D) None of the above 10 In the advantage of JMS which receive the message, client is not required to send request, Message will arrive automatically to the client? A) Reliable B) Asynchronous C) Both A & B D) None of the above 11 In which model of message domain is delivered to one receiver only, where Queue is used as a message oriented middleware (MOM)? A) Point-to-Point Model B) Publisher/Subscriber Model C) Both A & B D) None of the above 12 n Enterprise Beans to accommodate a growing number of users, you may need to distribute an application s components across multiple machines? 13 A) Transactions must ensure data integrity B) The application must be scalable C) The application will have a variety of clients D) All mentioned above Hibernate framework provides many built-in generated classes,which class is used in Sybase, My SQL, MS SQL Server, DB2 and HypersonicSQL to support the id column. The returned id is of type short, int or long? A) identity B) uuid C) seqhilo D) hilo 14 In Hibernate inheritance mapping which is used when tables are created as per class but related by foreign key, So there are no duplicate columns? A) Table per Hierarchy B) Table Per Concrete Class C) Table Per Subclass D) None of the above

17 15 We can do One to One mapping in hibernate by these ways? A) By many-to-one element B) By one-to-one element C) Both A & B D) None of the above 16 Second Level Cache implementations are provided by different vendors such as? A) EH Cache B) Swarm Cache C) OS Cache D) JBoss Cache E) All mentioned above 17 Session object holds the? A) First Level Cache B) Second Level Cache C) Both A & B D) None of the above 18 The Spring framework provides HibernateTemplate class, so you don't need to follow steps like? A) create Configuration B) BuildSessionFactory C) Session D) beginning and committing transaction E) All mentioned above 19 Web Services attempts to describe architecture based on A) Representational State Transfer (REST) B) Remote Procedure Calls C) Reusable Application Components D) None of the above 20 What is the purpose of the url json? a. Belongs to JSON object b. Reference JSON formatted data c. Both a and b d. None of the mentioned 21 Which of the following is a best practice for designing a secure RESTful web service? A) No sensitive data in URL - Never use username, password or session token in URL, these values should be passed to Web Service via POST method. B) Restriction on Method execution - Allow restricted use of methods like GET, POST, DELETE. GET method should not be able to delete data. C) Both of the above. D) None of the above. 22 Which of the following HTTP Status code means CONFLICT, states conflict situation while executing the method for example, adding duplicate entry? A) 400 B) 401 C) 404 D) 409

18 23 Which of the following annotation of JAX RS API states the HTTP Response generated by web service? 24 Which of the following is a best practice for caching in RESTful web service? A) Always keep static contents like images, css, JavaScript cacheable, with expiration date of 2 to 3 days. B) Never keep expiry date too high. C) Dynamic contents should be cached for few hours only. D) All of the above. 25 Which of the following depicts best practice, Linkablity for resource representation in REST? A) Both Server and Client should be able to understand and utilize the representation format of the resource. B) Format should be able to represent a resource completely. For example, a resource can contain another resource. Format should be able to represent simple as well as complex structures of resources. C) A resource can have a linkage to another resource, a format should be able to handles such situations. D) None of the above. 26 Which of the following HTTP method should be used to fetch resource using RESTful web service? A) GET B) DELETE C) PUT D) OPTIONS 27 Which of the following directive of Cache Control Header of HTTP response indicates that resource is cachable by any component? A) Public B) Private C) no-cache/no-store D) max-age 28 Which of the following is a best practice for designing a secure RESTful web service? 29 A) Validation - Validate all inputs on the server. Protect your server against SQL or NoSQL injection attacks. B) Session based authentication - Use session based authentication to authenticate a user whenever a request is made to a Web Service method. C) Both of the above. D) None of the above. g p resource? 30 Which of the following annotation of JAX RS API binds the parameter passed to method to a value in path?

RESTFUL WEB SERVICES - INTERVIEW QUESTIONS

RESTFUL WEB SERVICES - INTERVIEW QUESTIONS http://www.tutorialspoint.com/restful/restful_interview_questions.htm Copyright tutorialspoint.com Dear readers, these RESTful Web services Interview Questions